Because the 3rd edition is older, used paperbacks sell for $5–$15 on AbeBooks, eBay, or ThriftBooks. Physical books help retention (no screen fatigue).
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Thus, searching for “3rd edition PDF” likely points to an unfinished beta version or mislabeled 2nd edition files. The fully finished 3rd edition is still not in general circulation as a polished PDF. Because the 3rd edition is older, used paperbacks
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